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Research on endohedral fullerenes has yielded unambiguous evidence for the existence of selected inside‐the‐cage complexes. Milligram quantities of purified samples of metallofullerenes have been produced, and characterized via techniques that selectively probe the endohedral guest. Experiments aimed at a detailed understanding of the molecular properties of the endohedral complexes as well as of the material properties of compounds containing endohedral fullerenes have just started.
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Holleman et al. (1994) studied this question.
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